20528121101 has 2 divisors, whose sum is σ = 20528121102. Its totient is φ = 20528121100.

The previous prime is 20528121083. The next prime is 20528121109. The reversal of 20528121101 is 10112182502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20463302500 + 64818601 = 143050^2 + 8051^2 .

It is a cyclic number.

It is not a de Polignac number, because 20528121101 - 2¹⁰ = 20528120077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20528121109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10264060550 + 10264060551.

It is an arithmetic number, because the mean of its divisors is an integer number (10264060551).

Almost surely, 2^20528121101 is an apocalyptic number.

It is an amenable number.

20528121101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20528121101 is an equidigital number, since it uses as much as digits as its factorization.

20528121101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 23.

The spelling of 20528121101 in words is "twenty billion, five hundred twenty-eight million, one hundred twenty-one thousand, one hundred one".